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This 2003 BMW Dinan S3-M5 is a Canadian-market example that shows 75k kilometers (~47k miles) and has been with the seller for six years. A previous owner commissioned RCTS of Calgary, Canada to perform a Dinan S3 upgrade in 2007, which included supercharging the 4.9-liter DOHC V8 and installing new engine management software, a high-flow intake, larger throttle bodies, tuned velocity stacks, Brembo brakes, stainless headers, a freer-flowing exhaust, and more. Power is routed through a 6-speed manual gearbox to a Dinan 3.45:1 rear end equipped with a limited-slip differential. This E39 M5 is offered with a Carproof report and clean Alberta registration in the seller’s name.

This car is finished in Jet Black (688), and a 3M stone guard kit has been applied to the front bumper, hood, fenders, and side mirrors. The seller notes a surface scratch on the trunk lid. A Dinan rear badge is included in the sale.

An exterior walk-around video is viewable above. Factory 18″ Style 65 wheels are finished in gunmetal and mounted with Michelin Pilot Sport tires which have reportedly covered 3,400 miles since installation in 2013. A blemish is noted on one of the wheels from an improperly mounted wheel weight. Suspension modifications include a Dinan Stage 3 kit featuring monotube shocks and rear subframe reinforcement. Dinan-badged Brembo brakes are installed at all four corners.

The interior features a Black Nappa extended leather with Imola Red inserts on the seats and doors, aluminum dash and door trim, and an anthracite Alcantara headliner. Amenities include powered front seats with memory, navigation, a 6-disc CD changer, a stock steering wheel, and Dinan aluminum pedals.

The odometer shows 76k kilometers (~47k miles), approximately 6k km of which have been added by the seller during six years of ownership.

The 4.9-liter V8 has been modified with a Dinan S3-M5 supercharger kit, which was said to increase output to 621 horsepower at 7,000 rpm and 502 lb-ft torque at 4500 rpm. The kit also includes S3 engine management software, a high-flow ram-air intake, larger throttle bodies, tuned velocity stacks, 4:2:1 stainless headers, and a free-flow exhaust.

A cold start video is provided above, and an engine compartment tour is viewable here. A CTEC tender has been hard-wired to the battery.

Power is sent to the rear wheels via a 6-speed manual gearbox and limited-slip differential with a 3.45:1 ratio. A lightened flywheel came fitted as part of the S3 package. A high-performance Dinan clutch was added approximately 1,900 miles ago, with a receipt viewable in the gallery. S3 chassis upgrades include strut and shock tower braces, rear subframe reinforcement, and front brake cooling ducts.

The seller reports that this is 1 of 39 Dinan S3 M5 conversions, with a plaque on the radiator support indicating #29.

The Carproof report shows no accidents or other damage. The car was previously auctioned on BaT and is now being offered again by the same seller. A recent PPI was conducted at Vitek’s Automotive in Calgary, Alberta and is viewable in the gallery. A paint thickness video is provided below: